/ dɪˈfɪnətɪv; NAmE / adjective
1.
final; not able to be changed :
a definitive agreement / answer / statement
The definitive version of the text is ready to be published.
2.
[ usually before noun ] considered to be the best of its kind and almost impossible to improve :
the definitive biography of Einstein
► de·fini·tive·ly adverb
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WORD ORIGIN
late Middle English : from Old French definitif , -ive , from Latin definitivus , from definit- set within limits, from the verb definire , from de- (expressing completion) + finire finish.